已删除的集群，wayne 还会尝试连接集群

[olivewind]

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通过 web-ui 接入集群时候，填错 yaml，导致集群不可达时候，删除该集群
但是 wayne 一直在尝试连接这个已经被删除的集群，重启可以解决

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[wilhelmguo]

Fix